CSVB Series II - Columbia Heating

EQUIPMENT & OPTIONAL ACCESSORIES! WARNINGBurn and scald hazard. Safety relief valve coulddischarge steam or hot water during operation.Install discharge piping per these instructions.SAFETY RELIEF VALVE [ Figure 2, Page 7 ]Safety relief valve is required on your boiler. Water expandsas it is heated. If there is no place for water to expandinto, water pressure will build up inside boiler and system.Should this happen, safety relief valve will automaticallyopen at predetermined pressure. This will relieve the strainon boiler and system. Run pipe from relief valve outlet(pipe must be same size as outlet and open end must notbe threaded) to open drain, tub or sink, or other suitabledrainage point not subject to freezing. Failure to do so maycause water damage or injury should safety relief valverelease.EXPANSION TANKExpanding water flows into expansion tank. Tank shouldbe correct size. Tank is filled with air. As water expands itcompresses air in the tank to form air pressure cushion.This “spring-like” cushion serves to maintain correctoperating water pressure regardless of water temperature.This assures “full measure” of water, even in highestradiation unit of system. It also prevents blowing off ofsafety relief valve. Air in tank in beginning (with systemfilled with cold water) is sufficient for proper operation.Tank also serves as trap for excess air in system. Airwould cause gurgling in pipes and in efficient circulation inradiators if left in system.It is possible for tank to become “waterlogged” (filledwith water). It can also become overfilled with air. Thiscan happen after filling system with new water. Fittingsprovided on tank and in line to tank are for bleeding offexcess water or air.When installing this tank, it is important:1. Tank be higher than boiler top.2. Pipe to tank continuously rises up to tank (so aircan “bubble” up to it).DIAPHRAGM TYPE EXPANSION TANKDiaphragm type expansion tank takes place of conventionalexpansion tank. Carefully read instructions packed withyour tank assembly.Tank comes with 10-12 pounds per square inch air charge.This is the same as pressure produced in system byautomatic fill valve. When system is first filled, tank willcontain little or no water.As water is heated its pressure increases. It expands intotank, compressing air in tank. Compressed air cushionpermits water in system to expand as temperaturechanges. Diaphragm type tank can be mounted on airpurger fitting or at any convenient place in supply or returnline.AIR ELIMINATING FITTING (AIR PURGER)Air purger is used to remove excess air from system. Itis installed in supply line. It will eliminate air from waterbefore it reaches radiators and bleed off this air.MAIN AIR VENT FOR DOWN FLOW SYSTEMS ORDIAPHRAGM TYPE EXPANSION TANKBefore system is filled with water, there is air in pipes andradiation units. Some of it will be trapped as system isfilled . It is possible to eliminate most of this air throughair vent on radiation units. Main air vent will speed andsimplify this. Install on highest point in supply main whenall radiation is below top of boiler.AUTOMATIC FILL VALVEFor a safe, efficient operation, hot water system must becompletely filled with water. Adding new water, whenneeded can be done manually (by use of hand valve inwater supply line). Requires regular attention to system’sneeds. Automatic fill valve accomplishes this withoutattention. Install in supply line on hot water boilers only.Valve operates through water pressure differentials. It doesnot require electrical connection.DRAIN VALVEManual valve provides means of draining all water fromboiler and system. It is often installed in 3/4” tapping atbottom of end boiler section. Or it can be installed in teewhere return line enters boiler.WATER TEMPERATURE CONTROLWater temperature limit control in relay is adjustableand may be set as necessary. It may be set as low as140°F, or as high as 220°F. This depends on type andamount of radiation involved and weather conditions.CIRCULATING PUMPEvery forced hot-water system requires circulating pump.Separate pump or zone valve is required for each zone,if you have a two or more zone system. Pump must havecapacity to provide circulation required by your system.Pump is connected into main just ahead of boiler. It is alsowired to electrical system.BLOWER (Draft Inducer)Blower provides means for pulling air through boiler andexhausting flue gasses into vent system. Blower shutsoff when burners are not firing. This keeps heat in houserather than having it go up chimney.30